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xenn [34]
3 years ago
14

How do cations of the same charge change in radius as you move down a column in the periodic table?

Chemistry
1 answer:
zepelin [54]3 years ago
4 0

Answer:

<em>The cations of the same charge </em><u>increase </u><em>in radius as you move down a column in the periodic table.</em>

Explanation:

Moving down a column in the periodic table means to increase the main energy level and keeping the number of electrons in the outermost shell (the number of valence electrons).

The metals (elements in the left side of the periodic table) form positive ions, named cations, when they lose one or more valence electrons.

To depict this more clearly, consider, for example, the column 1 in the periodic table, which is the group of alkal metals: Li, Na, K, Rb, Cs, and Fr.

As you move down that column you ge the following results

Element     Period                          Number of                   Main cation

                  (main energy level)     valence electrons

Li                 2                                   1                                    Li⁺

Na               3                                   1                                    Na⁺

K                  4                                   1                                   K⁺

Rb                5                                   1                                   Rb⁺

Cs                6                                   1                                   Cs⁺

Fr                 7                                   1                                    Fr⁺

Then, in the last column of the previous table, you see that all the cations have the same charge, because each one is formed after lossing the same number of electrons from the neutral atom (1).

Since, as you move down the column in the periodic table, the valence electrons are in higher main energy levels, which means that the size of both the neutral atom and the and the resultant cation formed after losing the valence electron are bigger than the cation of the previous level. Hence, as a general rule, the radius of the cations of the same charge increase as you move down a colum in the periodic table.

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hat is the percentage of water in the following compound? Answer using three significant figures. Sodium carbonate decahydrate,
BigorU [14]
You need to find the whole molar mass of the compound using the periodic table to add the values. 

Na2CO3= (2 x 23.0) + 12.0 + (3 x 16.0)= 106 g/mol
H2O= 10 x [ (2 x 1.01 ) + (16.0) ]= 180.2 g/mol

the total molar mass is 106 + 180.2 = 286.2 g/mol

the percentage of water you can find by doing "parts over the whole"

H2O%= 180.2 / 286.2 X 100= 63.0%
7 0
3 years ago
372 mL is the volume of Aluminum, density is 2.70 g/mL what is the mass in grams
podryga [215]

Answer:

930 g

Explanation:

D = m/V     Multiply both sides by V

m = VD

<em>Data: </em>

V = 372 cm³

D = 2.70 g/cm³

<em>Calculation: </em>

m = 372 × 2.50

m = 930 g

The mass of Al is 930 g.

7 0
3 years ago
PLS ANSWER ASAP
Kazeer [188]
The answer is c this is the answer
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Glucose is stirred into water to form a solution. In this case, what are the glucose and water?
Alex_Xolod [135]

The correct option is C.

When glucose is stirred into water to form a solution, then glucose is the SOLUTE and water is the SOLVENT. A solute refers to a substance that is dissolved in a solvent. For instance, salt is the solute that is dissolved in salt solution. A solvent on the other hand refers to the liquid into which the solute was dissolved. For instance, in the case of salt solution, water is the solvent, because it is used to dissolve the salt.

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